William j



(No Model.) W. J. ELLIS.

SYRINGE SHUT-OFF.

No. 455,392. Patented-July 7,1891.

"WTHE v HH v MM UNITED STATES IPATENT O FICE."

"WILLIAM J. ELLIS, OF AKRON, 01110, ASSIGNOR TO THE B. F. GOODRICH COMPANY, OF SAME PLACE.

SYRINGE SHUT-OFF.

SPECIFICATION forming part of Iletters Patent'No. 455,392, dated July 7,1891.

Application filed March 30, 1891. Serial No. 386,915. (No model.)

= the enema to the pipe, and which, by compressing the tube, cuts ofi the flow through it. 4 The object of my invention is to produce a new and improved cut-off which shall be simple in construction, effectual in operation, easily applied and released, and in which the number of parts shall be reduced to a minimum.

To the aforesaid purpose my invention con sists in the peculiar and novel construction, arrangement, and combination of parts hereinafter described, and then specifically point-' ed out in the claims, reference being had to .the accompanying drawings, forming a part of this specification.

In the accompanying drawings, in which similar letters of reference indicate like parts in the different'figures, Figure 1 is a perspective View of a portion of the syringe tube, tip, and pipe provided with my improved shutoff in an open position to permit the flow through the tube, and Fig. 2 a similar view showing the cut-off closed.

Referring to the drawings, A is a soft-rubber tube provided with a tip B of the usual form having at one end a screw-thread on which the pipe 0 is fastened, at the other a flange to retain it in the tube, and in the center a flange extending beyond theoutside of the-tube Between the flange of the tip B and the pipe (J is clamped a strip D of metallic spring-plate having a central opening through which the screw-threaded end of the tip B passes. On opposite sides of this opening the strip D is bent abruptly from the pipe, forming two springs E E, arrangedto normally spread apart by their tension. The outer ends of thesesprings are bent toward each other at such relative distances that when sprung toward each other the end of the spring E passes beyond the spring E and in Fig. 1, its extreme end being again bent outward to form a thumb-piece. The openings in the bent ends of the springs are elon-. gated laterally, and at the extreme part'of the one in the end of the spring E the metal parallel with and of the same size as the part that forms the catch on the spring E. \Vhen the springs are held together, as shown in Fig. 1, the tubeArests free and uncompressed in the holes in the ends of the springs E E; but by pushing back the thumb-piece the catch is released and the pipe is compressed between the shelf F and the catch, which latter sinks slightly into the opening in the end of the spring E, as shown in Fig. 2, these wider surfaces preventing cutting or abrasion of the tube A if the thinner edges of the metal are used.

I claim as my invention- 1. A syringe cut-off consisting of two con- .tiguous parallel plates arranged to pass'each other, having openings that register to receive the syringe-tube, springs to constantly draw them past each other. to compress the tube,

and a detachable catch to hold them from separating, substantially as shown and described.

2. A syringe cut-off consisting of two contiguous parallel plates arranged to pass each other, having openings that register to receive the syringe-tube provided on their inner opposite faces with parallel shelves, springsto constantly draw them past each other to compress the tube, anda detachable catch to retain them from separating, substantially as described. a

3. A syringe. cut-off consisting of a strip of spring metal having an opening near its is bent inward, forming a narrow shelf F,

'nnto set my hand.

with the catch when the latter is released and lo compress the tnbe snbstantially as shown and described.

In testimony that I claim the above I here- WILLIAM J. ELLIS. In presence of O. P. HUMPHREY,

C. E. HUMPHREY. 

